Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 35,032	$ 32,901
Federal funds sold	17,351	22,019
Mortgage loans held for sale	13,417	4,381
Securities available for sale (amortized cost of $350,586 in 2012 and $343,059 in 2011)	360,946	352,185
Federal Home Loan Bank stock	5,180	4,948
Other securities	1,000	1,001
Loans	1,578,290	1,544,845
Less allowance for loan losses	31,245	29,745
Net loans	1,547,045	1,515,100
Premises and equipment, net	37,436	36,611
Bank owned life insurance	27,886	27,143
Accrued interest receivable	5,954	5,964
Other assets	51,342	50,844
Total assets	2,102,589	2,053,097
Deposits:
Non-interest bearing	359,097	313,587
Interest bearing	1,330,933	1,304,152
Total deposits	1,690,030	1,617,739
Securities sold under agreements to repurchase	54,127	66,026
Federal funds purchased	19,308	37,273
Accrued interest payable	202	232
Other liabilities	46,177	42,810
Federal Home Loan Bank advances	60,423	60,431
Subordinated debentures	30,900	40,900
Total liabilities	1,901,167	1,865,411
Stockholders' equity:
Preferred stock, no par value. Authorized 1,000,000 shares; no shares issued or outstanding
Common stock, no par value. Authorized 20,000,000 shares; issued and outstanding 13,894,540 and 13,819,319 shares in 2012 and 2011, respectively	7,204	6,953
Additional paid-in capital	17,046	14,599
Retained earnings	170,908	160,672
Accumulated other comprehensive income	6,264	5,462
Total stockholders' equity	201,422	187,686
Total liabilities and stockholders' equity	$ 2,102,589	$ 2,053,097